Broken Thumbnails on the Preview (WIP)

My apologies for the ugliness - we’ve been having issues with topic thumbnails breaking sporadically, so this evening I’ve tried re-installing, etc, and have only made things worse. We have some pros looking it over (including the plugin author), but I’m going to leave it as is for another day or so (for them to investigate), before disabling the thumbnails until we have a fix.